Friday’s unprecedented ransomware attack may have stopped spreading to new machines — at least briefly — thanks to a “kill switch” that a security researcher has activated.

The ransomware, called Wana Decryptor or WannaCry, has been found infecting machines across the globe. It works by exploiting a Windows vulnerability that the U.S. National Security Agency may have used for spying.

The malware encrypts data on a PC and shows users a note demanding $300 in bitcoin to have their data decrypted. Images of the ransom note have been circulating on Twitter. Security experts have detected tens of thousands of attacks, apparently spreading over LANs and the internet like a computer worm.

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Google Docs was pulled into a sneaky email phishing attack on Tuesday that was designed to trick users into giving up access to their Gmail accounts.

The phishing emails, which circulated for about three hours before Google stopped them, invited the recipient to open what appeared to be a Google Doc. The teaser was a blue box that said, “Open in Docs.”